Or you could read the rest of that sentence which states you don't do it at churches. NEVER SEEN IT! Went to church for years, never taught me about anything other than trying to brainwash me into Christianity. So will you be spreading the good word of Muhammad once you start preaching? Why not, the stories are about the damn same. There's others out there even more similar... but I am sure you know the names.
I get the feeling that I've been to more churches than you. Sure, not all churches are the same, but most of the ones I know of are a lot more open minded than what you have experienced.
BTW, if you really think Islam and Christianity are are "about the damn same," then you either didn't pay attention all those years at Church, haven't studied Islam, or your church was really messed up.